#include <bits/stdc++.h>
using namespace std;

bool f (int a, int b, int c) {
    return (c != a && ((b < a && b < c) || (b > a && b > c)));
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int a[3];
    int p;
    string t;
    
    for (int i = 0; i < 3; ++i) {
        cin >> t;
        if (t == "?") {
            p = i;
        } else {
            a[i] = stoi(t);
        }
    }
    
    a[p] = 1;
    if (f(a[0], a[1], a[2])) { cout << 1; }
    a[p] = 4;
    if (f(a[0], a[1], a[2])) { cout << 4; }
    cout << endl;
    
    return 0;
}